Short answer
In steel spiral reinforced PVC hoses, the spiral is a structural element that contributes to the shape stability of the hose. The presence of a spiral alone does not mean resistance to full vacuum or reliable electrical continuity; the two properties must be verified separately.
Source: S036
Technical explanation
In a suction line, external pressure narrowing the hose cross-section can affect flow and pump conditions. The manufacturer's vacuum value is used within the scope of the temperature and size for which it is given. The fact that the spiral material is metal does not mean that it makes controlled contact with the end fittings or provides measured electrical conductivity along the entire line. Use of the hose on the discharge side also requires an independent pressure rating.
Source: S036
Topic-specific checkpoints
| Item | Description |
|---|---|
| Vacuum | Manufacturer value dependent on size and temperature |
| Spiral | Structural support; not independent electrical evidence |
| Bends | Ovality and minimum radius |
| End assembly | Clamping system suited to the hose construction |
Source: S036
How is it assessed in practice?
In a suction line order, document the pump's operating condition, the fluid, the suction length and the tightest bend. If the hose is dragged on the ground, monitor external damage separately; if there is a sharp bend, monitor local ovality separately. If there is an electrical requirement, ask for the manufacturer's assembly and test method instead of haphazardly exposing the spiral end and connecting it to the body. Include in the competent assembly assessment whether the hose clamp presses on the spiral and creates uneven clamping.
Original editorial recommendation; not a clause of a standard.
Frequently asked questions
Does a metal spiral replace grounding?
Not by itself. The end contacts, continuity and the application requirement must be verified.
Source: S036
Source coverage
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S036
Industrial Hose Safety Connections Gates · accessed 2026-10-19 PDF pp. 6–8 construction and selection; pp. 10–19 maintenance; pp. 21–27 special services